[rrd-users] Vedr: rrdtool fetch boundaries

morten bjoernsvik morten_bjoernsvik at yahoo.no
Thu Sep 22 10:56:13 CEST 2011

|Fra: Alex van den Bogaerdt <alex at vandenbogaerdt.nl>
|> Hi All
|> I'm extracting statistics from lots of rrds using rrdtool fetch, but it
|> seems like
|> fetch is rather fuzzy about the -s and -e settings
|A combination of unfortunate accidents with programming off-by-one errors
|and people not understanding the fencepost error
|What usually helps is to ask for {$start_you_want}+{$offset} to
|{$end_you_want}-{$offset} where offset is choosen such a way that it does
|not make another RRA more suitable. Generally speaking "1" is already

Thanks Alex

Decreasing the boundaries with a step on each side seem to work ok. for most intervals.

I also use the mean(), median() and standard_deviation() so it does not affect me much.

Thanks for the link to wikipedia article.


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